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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55697a7979f00e50d2f5bf3e93f1de9141e310ee6b7a783c92bb4a6de3f60c9' 
  AND token = '+ooPUrFnJEqVTttmgYD5VGuHoSdq0gOs//fHP8nJDLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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