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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d6c0a101c75591d2ce7cc43d7b822a7e4495b9215493a19a2c8ccbb468ed9e' 
  AND token = 'uGEhFMOX6BBqT8VS9fqhNDmPQT9b7PNib+L4pxMxcY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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