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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7961e5c74feb7fcff118eec9a2102e7f1363fc799515552caeb22cb65383d5' 
  AND token = 'ILccfagQKZK6/2blDKeIDOQHG9/nnFJfgHY04T/06aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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