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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928f265ea6d285d6181ada267f49bb300ffa2579afcfc7f6042984ca1758e267' 
  AND token = 'X6JQ0LK33nndpAa5olBiI/BKTeP3cMV0FefXXTfCBUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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