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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84909293ea1dd47ce89f888a19e8a63ac8d74d366e3870b9beea7bfbae95ed8' 
  AND token = 'PPa6y2EnFO06JNgLM50FeUfCBdTj9pgA975nLqkfGwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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