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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893a47444eee3c1a9a4a0a68c344d51a576fd9ee57d81435ae3c7367e728bb0a' 
  AND token = 'rzV0pJHHLw6OrfUHXbRcB9/9w0D5n6hUCflwsT1SrMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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