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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aec276b0377f866f3e463eae1b0c8212fc90fcdbfad5bcb9f9ee0216bbc00a6' 
  AND token = 'wCXYMCbLnFxbB+BNSC+wlkYjkILKkLH9VPjicMx+tGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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