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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6f31811033959504cd31610e831f843abcaa767955c93ef781efe6c441e979' 
  AND token = 'ThsZ3yRES62hESaaHv0/Z4BLTR0HL2YUnsUkqKu37B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}