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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde50adb36ceb3b1b84157f8007c16c3440e5ae80e7d962c045f952a091f49bb' 
  AND token = 'oh0HBIKxxVVqTx3YYgOtuPuqddAbUS6pjmNmFExuM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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