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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a735f1d2e389b4b2ef7153274337af4126818c5f148123aef8cfc581513dd3' 
  AND token = 'TihnlEAPSQV79SYBtq9N4NOiJS/OFsZMcHv7dnzqVEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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