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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643389bd6e04fb12271ca0376550f1be597b831c46937850a22345301028db43' 
  AND token = 'HlV0dnBW8icA4pglrUnll9hQZNq+5lngvx8U67qIok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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