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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0566901a2b2b83f43a03ac9864456e214071c0907a5de75e881e5d857ed1069' 
  AND token = 'P30A8w0r47n/wdY0Z9W4JtzJwi5IVCuKtaDTm3MPUY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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