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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf72d2443ff68e1556f7196f0cd115a4ea68b1ba8dbe7240c82e27ddae6b7b5' 
  AND token = '95wpLcScfu/runX28M52I7bSEiV4f9HX3A7Sgnp+RLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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