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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a2b675cc82686f8968439cdefbf6a2675d90019098b62fc1b7ad2dc10c5aae' 
  AND token = 'eErB8Zeq7yCARXINFv+aay5P3ivmUHEc+WVHoabGw7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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