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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7341a297de3001b1941fb40ae3845e9a134e2a396a4f213629453e581f61cf4b' 
  AND token = 'DDYXMivlIrJB7QepJoDdHnwdBN1gSZH1B1pvhNAtDUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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