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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9769895a6a1a6e3886de7c8a0d41cd8f841ffa7964a2e26100cdc2f5ea022ee2' 
  AND token = 'seir6II1A6Mfqj7kDDvFlV/7UhzvuQVwvRIEU1zWqIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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