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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27299186459766ad8c8ff40fdc1329193f90b291a4600eda3623243abbd0bf6c' 
  AND token = '1hUTBxtPYxPcgLrnyT6f2yIogsdUejjlbQgzbXLQCq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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