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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4bf13f9751d17987d6c9656d8b9d690195c6987310789d1f8187cbfd8d069a' 
  AND token = '8yWcp+Fu8BCXc/jqi8ItetqpPpdgruCyd6b5pWerJok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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