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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3186a150aa569c786e292bcd22d1d6c61e04a8dfa9459f8dd2cb7eeb24de613' 
  AND token = 'eDebrUZ/8b2CaBmkeL2KVCD/Mtztqw3JFmS/ym382Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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