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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1b240ad714a15108bd7275a552d5e3ad00c159a5b31800ccb227769de22cea' 
  AND token = 'Ur9sR0ux4H7E8qQ3JT0Pxjp/TfJOtQD8jlsM6AeHaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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