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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbda1e1de6b4d042cb70e07859c87858a5d1562531f592d6690256c49524916c' 
  AND token = 'tfHzd3VV8LxJMa1Dc2v8BX9ENHantEcLRmzT/F730Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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