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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971a671db5d02b82c2e26b4c50c84cf0816c5d29670dfc0113e1ef551e6f0f85' 
  AND token = '7ujPRy1tcPhwgRNT2+P2GZfynSR6eqt5PzeYA1p1yGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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