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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda6f9897b582807867ac1b4c8828391cf52d475dc198e8383682d2aad83aed6' 
  AND token = 'EmjPb/8Z1m0KCC9clFZN4JMUc8ZQPhAIbmF9K1NcrS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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