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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56bc93fb8b73cad528c9c9b0bc77979004085a2e2da1d294129e62304a32525' 
  AND token = 't4PtGHjLsD71osYVqW/8Sbu4o3BpzEgqm9EooOrnrC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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