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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ccf4e08989e5f51db535610cb1d10bdf4798e1b8823b6772511a9f65ec71d1f' 
  AND token = '5JfTrVmahuW/l5rRFmeFjwcXDUGCF8MwRRfqHKCTbQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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