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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1eb6ebd380eaac0294e57f1f96e2687239826b6d9f637a07e951fc9373cb5b' 
  AND token = 'tSyclL9nAVQ63fU00/DZFbKJy7nI1g/o6CAbwHue8Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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