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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9ee107b78c9e39d2a388691b79a9ad7f4323c4bdc9ed138b8a97db45aa5448' 
  AND token = 'uWs5Gz53X6/CcESXt+17mrMtY0fuw7A76BbKdrpZNpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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