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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2b5db1f177eb96df88ba706d2dfca338591b7d8736529672395286790b8d5b' 
  AND token = 'xoxDopHYSNj5SD1tfG8SXo8C/nEUBEZTZK12UPgeHHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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