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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7151992e9d9ff376a2a80d16c9ea06df6ef65f5917aed19a89e13a910427c920' 
  AND token = '5AqLiE7+jnHCfnbyps1B+vaNu9WcuMJPoslnmbSG78U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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