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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a2bbcf1311a92328bf2073e7c5c4890f19a7fdd40e091eeaaf34a43434f99e' 
  AND token = 'I/58ccWRTVyz7dhN5dhcFQj4qgRrhx4nH+Igee4VhLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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