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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a5287112a0e35813c217a33bd648e22b0f4cbc6edbe47224c7e6aa89c3f4fb' 
  AND token = '4OX8DvidUzJuz9zKN6ncd4XgUR2zLOdLKUIKDr2tyrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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