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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e131145221d20ffd00aab34796d3f49ca16d9a5c06fc264ce25670c7c7580aa' 
  AND token = 'S6WOYBq8e3+83AeRFyLlAZBqiYTogpkZ+Xi18NfuYK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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