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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08244c8ebd123e3095e9fb57c070e3838a1043a899c2234b01811071d8cad1dc' 
  AND token = '7ElJFWdWRKvye1XdFI9eY8Qh3yKIJNRuqwm7wA+vsGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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