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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ef67aae2bcd8d9a6174d34e0188aab3010f2057fc0be302926fc49d8a58af5' 
  AND token = 'cyodcOP2bBhApH8Vi4mC8/eOXQ38J1A+Q+Z57tG111k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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