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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a617bc40163fa6179c988ca24f1163137f80ab9c0d4b2ea5561bc587dc4b5eb' 
  AND token = 'c130sSwWEkqMI/RGBQkL/svs9tD0rptSDR1/31E1uCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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