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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfa82cb908728b86fa4f8712f470883f619a59a120b8500dfadc8b042a9a5a9' 
  AND token = 'ngYhMV9xrrwuGWmfzeukfUm07vLF+OTTlIwUgIdIc8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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