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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8805c2054e170bc6d07c0267e1b1bdd62d368eb9d10d54fe56303df6fea9b58e' 
  AND token = 'bMHL1avJ5AlIPBPkmVYy7b4elJHNz9YTfucdCYD6hbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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