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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e7c38b330d9e4064deb46dbd4163fc885565cc94d14c85ac8087defdd71615' 
  AND token = 'h9oF4hFDR9Pvs3zc8dFzqL471ylh26Po5Az6KsLbgNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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