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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6330ec51f4262480f50ac4d6f9492f70c4d451411d7533212f6caa2e7cb57a42' 
  AND token = '9EMM2tehp+RLSh4cPhz0HTU/Go8x7j4Z37e6XQBMDPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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