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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de047532c4647ae7b5c2c87e8bd9dda86dc62811d2550a2f7d0dd49c16c1a5c' 
  AND token = 'qAAXRsZhgv6buYiMaLCyFKEyvF1qmwMRyCIPd+RGUSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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