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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c029d98773f381f5e6ba8c3a753fb2c7be9b177fca830f28c1e7c63b6e92f4cc' 
  AND token = 'kv06uUvPfnzKaXEs7Uy/MHXmj9hgG8lLybnAerYSrXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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