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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8d1968d1a5ff47e2312618945466aaaea93a24bbc16684caa503402d0b84ca' 
  AND token = 'sPDStvNfMD21XxQ85K1Z3hgqU+Zg/WFgnwoX5SXkVDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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