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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a82efcc35118788d91fa6e70e392947ddb0fe182c5cc33167ab217e1dae0e6' 
  AND token = 'p4oSDVRfOUpla8nBsK6wTCeARggRg2kh+05YuEI8SmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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