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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebec8e7ea81ea13b88d55a7722a6c3666b301e05eae8711d4990b9dd8a4961b' 
  AND token = 'Ox+qjV2htFFs3SX6vK6R/cs112ZZo4YjiV3/6Z1+ubU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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