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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662d20fdf058941fbd53d8a9e041570032b5d76c3b111ceb5ede7c12ef4d7d71' 
  AND token = '7D+HrxuBeGYADND9rzPJfG2+UOKv4xqLS0LyF1H/z4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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