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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d4c50fbd5b0c35de5bd34a56635eb6c19e1c7e441693477d0a6e25f51789bf' 
  AND token = 'zcNLv1ZuY+rOEbOZXnx1BKuxOFVoW5kN/VA+6wA9ioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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