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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc68b5e62d033b466d2924451fc2c6602bbbd94e07a0d8a1b126405c4a4dfe68' 
  AND token = 'WBJ5m3S7UTHaTsAB3oIL5hZiPfXY2WGCASzo1w6+E2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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