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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5345b02bb97a7915a6b43efe264873de97eb73f13ede6077c3910f50e9095e76' 
  AND token = '/zqvlZrWCtrJPrtjwrOLaZr66jz3IZ/EQSxaJt91xv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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