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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4576b0bceecd5e6fe360c18fe8c7c9247cd9376424efa63329a1e6bcd677a0c2' 
  AND token = '7Go0nVhmd+mdmhLjI+rbCrT2dlOziowbG8JVTm9IkkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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