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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4487a58a29309f6e23a74113efbb02e9c44cdf2e53feebe3389b93ccb694bcb' 
  AND token = 'rKYuEOq3kRxSjwZOlt2aFKvf2APs3ecorQZLXNXpAKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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