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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db2a39e98a9e1dc8bcff9684e431ddc930eeafb6ca7956e5b30c353097d6238' 
  AND token = 'ozqYxRhWNflW+04YRn0oAzkTmlB5W3rNRQwnioJkGXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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