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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8da720243f5c053d01c974de372a51a23c9e32a3571edae75040681baa276e' 
  AND token = 'dGHYA++SKJ2Iw0E65gnjQma5q5+ky0NIUPLuXVuRLQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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