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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad43aa51d4eece2465e3f2aa3ce372fdf2c1c4c6000dc6531ef7813b5c6ed8c0' 
  AND token = 'OnbkyzpTokPb6kKaqj/WBEnEWlyLxAEB3yTDeFx6RPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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