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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b9a8f6e0b9ef3557045b123f5f91da93bcc81f6b6920a2f9f40ad741ab2a53' 
  AND token = 'F9BLGN8nP+41EIBDPM47IzSw57lJrXe2cbwRHPH8/yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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