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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b055fb30464a8152d0b439141112591f51043f4fab96c78f33c117109df579df' 
  AND token = 'k+uHEEMusiAO7JSih8JDT80HFvi3BsT/wUnhY1ODj7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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