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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8b5b322b829d0cd635c6216242eb85043ffcf2d07d97fe1ba252e97e5d4cf2' 
  AND token = '/X86TC6zQ0w9WjGPoRUW3nwfugEb+68yjqboHEqNR8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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