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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e64c25dda1dbd941841f2c6d1b28fcf2760eba83434e03b69ebe02c85843d6b' 
  AND token = 'WklgGqr9FVe6jV02rDlkKrPOabQOW0j/SW3rpAPpYOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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