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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f566791aecabbb5fde6f9c02ff09ea9f5a0fc7612dd198e452860b96e4a29d21' 
  AND token = 'h/UgnnAZ5JqiPXhfzEhkPgcAO5pi+Dr1aYo3LkemSGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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