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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bc5efbd5fae5a414b38403888cc9dd279f20f66316979bd3dfe586c0940961' 
  AND token = '01bVLC783M9hH/aPuo88+OIZkzlM5kNb87QohMnWJgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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