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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa055ec2a3c1d61b34de5c9b5165d7db8f8ebe2c5bab946a5b1c4bc81025e7' 
  AND token = 'l9zdpVF9SUz0Mj85UerZRhwFIBj0zQNcLXqyZNB0TyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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