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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d88f2bd6d4c3a36ac8328a7aabf0042c216c1581986fd968898b77d22af126' 
  AND token = 'pv5w0+qM0GNJQTghOi3g3JS5ANYxg6iAHYotNjcow+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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