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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdbdcdd8ee55b1aac96edfac03cd8e221a5c87915823b5962a4b1e9540e4456' 
  AND token = 'p/SwMOuhhawRpFmvuQTSyWlda502DyoOOJ8EiAvISSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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