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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31379406e8693ec6a69141835dccb12a32771bb3134371579ed16b765c87211d' 
  AND token = 'lYmXXvy/SwWZhWAVj+xxTS71PdV75Tb781ldaoOTqV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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