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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8bd8c8c30b009b4ac7b039a99d9293a5e5341752ad980668121085db537d41' 
  AND token = 'BUh2yxANAn4L+oT0BWk2xHDfxk81GJM63Agf7ekbqow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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