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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7936c703ecef56e91aedf37958404a82cdeaf4a088de49ee91f999f542ad588f' 
  AND token = '7jLRj6ZIRyPOWCoLUtQngDGaSxSdOj70zEGazZq5llo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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