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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb1c03d407f82d621253c83614bcd453dcb42f9f71455df600cffeeca8a26b5' 
  AND token = 'e8toLdyUnI66e0n5Rulh0BSdSlojLOT6Ql7VfjTHsas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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