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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661e2359ff18f28292684804aac2b44eb2cd8dbb4c7e829ecea4d88b62cbecad' 
  AND token = 'xUscepfIv/CsudjH/2KM/cYQHI8kP8/te/d/EepjTak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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