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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee47707c6937cde2453d8d2760b9b6eb53e04b2472526efc63dd90d08e02a9f' 
  AND token = 'rJ05JieVGfwpQm3q8OMTdKpgYeQU2CzgUY/yExwChkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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