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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcd1de7abf52ab63c0e84c7998443c6aa8d95e76628be87bf18f6641974b14a' 
  AND token = 'YsSwcwTkhRGwNxOcMtMQk/7wuZW31kXtGAdGCxHjXrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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