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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8ba5974fd9694503ab08faee611184f419449f60d11115de941253d1455877' 
  AND token = 'GukshhuCOOdFj48e6NxQuEnuF7xJv0F/ULH8icqumW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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