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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711181ea0cb422035cae80da06ef6b637a72cfe606e9e62d1378248040dc8c69' 
  AND token = '3xVUQ7aj70KCEWEMfcbbrNsGEmfSA3cuHJZAl/x9GVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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