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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9359abd5f89c98a46ae3bd6103af0d7db12d13734f377e045822bf184ffe6e42' 
  AND token = '6ZL0NokVgXVMQIGAsN3H3U1bk4mtz3cOX3ydBvqWqKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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