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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abec79e18f0ce04a9515067c1a80cf91467b7e8253539d41bcf68dec5ee6b8e0' 
  AND token = 'k/TifgTv0fnFBq5elOruJ2CSYcFonYCRp2/wTYk+5R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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