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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec932e192e82dc7e6d191dcb4b06da56e89330083537b014643590f492892309' 
  AND token = '5RHFA+rGME+dXwYcdcXQ2BOtGVO96TGX3ok2bu6iB/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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